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Thread: ZwCreatefile/ ZwReadfile

  1. #1
    Join Date
    Oct 2010

    ZwCreatefile/ ZwReadfile

    I need to read a file, and output it's text to the kdbg console.

    For the moment- the main priority is opening a simple text file. The problem is not so much the code- just how to structure and compile it correctly.

    Been trying to break it down into steps, hoping to compile the following code but I can't seem to pinpoint what goes where.
    Any help?
    Refer to bottom post for continuation:
    Last edited by StriderH2; May 12th, 2011 at 06:46 AM.

  2. #2
    Join Date
    Oct 2010

    Re: ZwCreatefile/ ZwReadfile


    #include <ntddk.h> 
    #define  BUFFER_SIZE 30
        HANDLE   handle;
        NTSTATUS ntstatus;
        IO_STATUS_BLOCK    ioStatusBlock;
        LARGE_INTEGER      byteOffset;
       CHAR     buffer[BUFFER_SIZE];
        size_t  cb;
    NTSTATUS DriverEntry(PDRIVER_OBJECT DriverObject, PUNICODE_STRING RegistryPath)  
              NTSTATUS NtStatus = STATUS_SUCCESS;
             /////////////////////// THIS SECTION /////////////////////////////////////
    UNICODE_STRING     uniName;
        OBJECT_ATTRIBUTES  objAttr;
        ////////////////////////////////\\SystemRoot\\ or C:\WINDOWS / C:|WINNT
     RtlInitUnicodeString(&uniName, L"\\SystemRoot\\native.txt");  // or L"\\SystemRoot\\example.txt"
        InitializeObjectAttributes(&objAttr, &uniName,
                                   OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
                                   NULL, NULL);
    //Load the buffer (ie. contents of text file to the console)
     ntstatus = ZwCreateFile(&handle,
                                &objAttr, &ioStatusBlock,
                                NULL, 0);
    if(NT_SUCCESS(ntstatus)) {
            byteOffset.LowPart = byteOffset.HighPart = 0;
            ntstatus = ZwReadFile(handle, NULL, NULL, NULL, &ioStatusBlock,
                                  buffer, BUFFER_SIZE, &byteOffset, NULL);
          buffer[BUFFER_SIZE-1] = '\0';
              KdPrint(("&#37;s\n", buffer)); //Print contents of text file from Windows/Windows NT folder to debug console (Debugview.exe)
              //DbgPrint("Hello World\n");
      return 0;
    Last edited by StriderH2; May 12th, 2011 at 07:43 AM.

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